Get off Tokyo Metro at Omotesando Station.
(Ginza Line, Chiyoda Line or Hanzomon Line)
Go out through Exit B1 or B3, and you'll be on Aoyama Street.
Walk down the Street heading for Shibuya for 1-2 mins.
Then you'll find Kotto Dori Avenue on your left.

Walk along the Avenue for five mins (400m).
If you come across HUNTING WORLD or KENZO at the third traffic light, you have come a bit too far.

Just one block before, there is a small lane on your right between SURUGA ISHO and PAUL SMITH.
Go into the lane and in about 100m ahead, you will find Maki Shop on your left.